The sigtrap pragma is a simple interface to installing signal handlers. You can have it install one of two handlers supplied by sigtrap itself (one which provides a Perl stack trace and one which simply die()s), or alternately you can supply your own handler for it to install. It can be told only to install a handler for signals which are either untrapped or ignored. It has a couple of lists of signals to trap, plus you can supply your own list of signals.

The arguments passed to the use statement which invokes sigtrap are processed in order. When a signal name or the name of one of sigtrap's signal lists is encountered a handler is immediately installed, when an option is encountered it affects subsequently installed handlers.

your-handler will be used as the handler for subsequently installed signals. your-handler can be any value which is valid as an assignment to an element of %SIG. See perlvar for examples of handler functions.

These are the signals which were trapped by default by the old sigtrap interface, they are ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP. If no signals or signals lists are passed to sigtrap, this list is used.

For each of these three lists, the collection of signals set to be trapped is checked before trapping; if your architecture does not implement a particular signal, it will not be trapped but rather silently ignored.